1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #ifndef __INCLUDE_RTE_LRU_X86_H__ 6 #define __INCLUDE_RTE_LRU_X86_H__ 7 8 #ifdef __cplusplus 9 extern "C" { 10 #endif 11 12 #include <stdint.h> 13 14 #include <rte_config.h> 15 16 #ifndef RTE_TABLE_HASH_LRU_STRATEGY 17 #define RTE_TABLE_HASH_LRU_STRATEGY 2 18 #endif 19 20 #if RTE_TABLE_HASH_LRU_STRATEGY == 2 21 22 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306) 23 #include <x86intrin.h> 24 #else 25 #include <emmintrin.h> 26 #include <smmintrin.h> 27 #include <xmmintrin.h> 28 #endif 29 30 #define lru_init(bucket) \ 31 { bucket->lru_list = 0x0000000100020003LLU; } 32 33 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU) 34 35 #define lru_update(bucket, mru_val) \ 36 do { \ 37 /* set up the masks for all possible shuffles, depends on pos */\ 38 static uint64_t masks[10] = { \ 39 /* Shuffle order; Make Zero (see _mm_shuffle_epi8 manual) */\ 40 0x0100070605040302, 0x8080808080808080, \ 41 0x0302070605040100, 0x8080808080808080, \ 42 0x0504070603020100, 0x8080808080808080, \ 43 0x0706050403020100, 0x8080808080808080, \ 44 0x0706050403020100, 0x8080808080808080}; \ 45 /* load up one register with repeats of mru-val */ \ 46 uint64_t mru2 = mru_val; \ 47 uint64_t mru3 = mru2 | (mru2 << 16); \ 48 uint64_t lru = bucket->lru_list; \ 49 /* XOR to cause the word we're looking for to go to zero */ \ 50 uint64_t mru = lru ^ ((mru3 << 32) | mru3); \ 51 __m128i c = _mm_cvtsi64_si128(mru); \ 52 __m128i b = _mm_cvtsi64_si128(lru); \ 53 /* Find the minimum value (first zero word, if it's in there) */\ 54 __m128i d = _mm_minpos_epu16(c); \ 55 /* Second word is the index to found word (first word is the value) */\ 56 unsigned int pos = _mm_extract_epi16(d, 1); \ 57 /* move the recently used location to top of list */ \ 58 __m128i k = _mm_shuffle_epi8(b, *((__m128i *) &masks[2 * pos]));\ 59 /* Finally, update the original list with the reordered data */ \ 60 bucket->lru_list = _mm_extract_epi64(k, 0); \ 61 /* Phwew! */ \ 62 } while (0) 63 64 #elif RTE_TABLE_HASH_LRU_STRATEGY == 3 65 66 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306) 67 #include <x86intrin.h> 68 #else 69 #include <emmintrin.h> 70 #include <smmintrin.h> 71 #include <xmmintrin.h> 72 #endif 73 74 #define lru_init(bucket) \ 75 { bucket->lru_list = ~0LLU; } 76 77 static inline int 78 f_lru_pos(uint64_t lru_list) 79 { 80 __m128i lst = _mm_set_epi64x((uint64_t)-1, lru_list); 81 __m128i min = _mm_minpos_epu16(lst); 82 return _mm_extract_epi16(min, 1); 83 } 84 #define lru_pos(bucket) f_lru_pos(bucket->lru_list) 85 86 #define lru_update(bucket, mru_val) \ 87 do { \ 88 const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16, \ 89 0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU}; \ 90 const uint64_t decs[] = {0x1000100010001LLU, 0}; \ 91 __m128i lru = _mm_cvtsi64_si128(bucket->lru_list); \ 92 __m128i vdec = _mm_cvtsi64_si128(decs[mru_val>>2]); \ 93 lru = _mm_subs_epu16(lru, vdec); \ 94 bucket->lru_list = _mm_extract_epi64(lru, 0) | orvals[mru_val]; \ 95 } while (0) 96 97 #endif 98 99 #ifdef __cplusplus 100 } 101 #endif 102 103 #endif 104